Feeding mechanism for sewing-machines.



Patented luiy l, |902. L. UNDERDNK.

FEEDING MECHANISM FOR SEWING MACHINES.

(Application med Jan. 9. ms.)

2 Sheets-Sheet I.

(No Model.)

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pas Nonms uniss co. PNoTmun-lo., msmnsmm u. c

No. 703,8II. Patented July l, |902.

L. ONDERDONK.

FEEDING MECHANISM FOR SEWING MACHINES.

(Application led Jan. 9. 1896.)

(No Model.) 2 Sheets-Sheet 2` NITRO lATnNT ITIFFIOE.

UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

FEEDlNG MEOHANISM yFoR-sswnxlc-MAOHINES.

SPECIFICATION forming part Of-Leaers Patent No. 703,81 1, dated July 1, 1902.

Application inea January 9, 1896. Serin No. 574,889". N moans;

To a/ZZ whom, fm/ay concern.'

Beit known that I, LANSING ONDERDONK, a

citizen ofthe United States, residing at Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and use-v My invention relates to sewing-machines,

and particularly to mechanism for feeding the goods to the stitch-forming mechanism., The object is to provide a simple and effective mechanism for operating the feeddog of a sewing-machine, and one which is applicable either to fiat or cylindrical bed machines and to those which either feed longitudinally or transversely of the bed-plate.

The invention consists, primarily, in a feeding mechanism for sewing-machines including a feed -dog supporting member, herein shown as a carrying-bar, Withmeans for-operating it, including an inclined eccentric, with means for swinging it to vary its inclination, with means for imparting to said eccentric the necessary movements to transmit to the feed-dog-carrying bar its movements, as hereinafter referred to.

The invention also includes various other matters hereinafter described, and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a sewingmachine embodying the invention. -Fig 2 is a plan view, a portion of the framework of the machine being broken away. Fig. Bisa,

front view of the strap, and Fig. 4L a similar` view of the eccentric, through which parts power is transmitted from the driving-shaft to the feed-dog-carrying bar; and Fig. 5 is an end view of the feed-dog.

In thedrawings, Figs. 1 and 2, the invention is shown as applied to a sewing-machine having a cylindrical bed, and in which the feed-dog is arranged to work longitudinally of the arm. Furthermore, in said drawings a novel construction of looper operating mechanism for use on a single or double chain-stitch machine is illustrated; but it will be understood as to these features that as far as the broadinvention in feeding mechanism for sewing-machines is concerned it is not intended to limit it, but the claims are intended to include the invention whether applied to cylindrical bed,l or fiat bed feed up the arm or feed around or across the arm machines or whether the machine'bea chain or lock' stitch machine and no matter what form lof looper or shuttle actuating mechanism be used. Referring now to the drawings, A represents the base or standard of a sewing-machine having the cylindrical bed-'plate B, the

gooseneck C, needle-lever D, needle-bar E, presser-barF, needles a, loo'perh, and presserfoot c. The looper-operating mechanism is herein shown as comprising a looper-carrier CZ, to which the looper is secured, which looper-carrier d is fixed to a transverse shaft c, which hasa sliding and rocking movement in xed bearings by means of a pin or rod f, eccentrically connected by a ball-and-socket joint witha driving-shaft and operatively connectedV to J[he looper-carrier d or shaft c, whereby in the construction herein shown in the rotation of the driving-shaft a looptaking movement in the arclof a circle and a needle-avoiding movement at right angles to the loop -taking 4movement are imparted tothe looper. This looper movement, however, formsno part of the present invention, but is described and claimed in my application forpatent filed January 23, 1896, Serial No. 576,593, patented October 12, 1897, No. 591,541. lhave also shown herein a take-up mechanismfor the under or looper thread actuated from a projection g on the needle-lever` and comprising nipper-springs JL, betweenpwhich the thread is grippedI as the in my application forpatent filed January 23, 1896, renewed August 23, 1897, Serial No. 649,243, and patented October 12, 1897, Serial No. 591,546.

G representsadriving-shaft, herein shown as the main shaft of the machine, having at its inner end a belt-wheel H, by which it is driven, and carrying at its outer end the collar 7c, to which the looper-rod is attached. This shaft G extends longitudinally of the bed-plate of the machine and has the usual eccentric and connecting rod for'operating the needle-lever. It is -provided with a beveled gear Z, meshing with a similar gear n on the transverse shaft I, which has a hand- Wheel K, arranged for the convenience of the operator.

The driving-shaft Gr is journaled near its outer end in the standard L, and at a point intermediate the length of said shaft there is secured upon it an eccentric M by means of a pin o, passing through the shaft and eccentric. The eccentric is preferably arranged with its vertical axis at an inclination to the longitudinal axis of the driving-shaft, and its angle of inclination is adjusted by means of screwsp, passing through the driving-shaft and bearing against lugs q, projecting from the eccentric, by which screws the angle of inclination of the eccentric to the shaft is changed by swinging the former in one ldirection or the other on its pivot o.

The eccentric M is provided with a groove r, in which fits a strap O, having an upwardly-projecting post s, screw-threaded, as shown, for the reception of the nut if.

P represents a bar or rod pivoted at its rear end between lugs or uprights Q, projecting from the rock-shaft R, journaled in the frame of the machine.

The bar P works in a groove u., formed in thestandard L and at its forward end widened out to form two branches o c to allow of room for the looper mechanism, and secured t0 the outer ends of these branchesor forks n c by screws fw is a yoke or arched piece S, carrying the feed-dog. The parts P, c, and S constitute a feed-dog-,carrying bar or frame.

The bar P is formed with a half-socket @and the corresponding part of the socket is formed in the piece T, secured by means of screws 'y' to the bar P, the two when placed in position forming a socket for the reception of a ball U on the post s. By this arrangement a balljoint connection between the strap and the feed-dog-carrying bar is provided, and as the shaft rotates, and with it the eccentric, the strap fitting in The groove of the eccentric is raised and lowered and the bar P, and with it the feed-dog,also raised and lowered. At the same time, by reason of the pivotal connection of the bar or rod P with the rocking frame formed by the uprights Q and rock-shaft R and the inclination of the eccentric to the axis of the driving-shaft, the bar or rod P will be reciprocated backward and forward,any variation of the angle of the eccentric M with respect to the driving-shaft increasing or diminishing the amount of forward and backward movement of the feed-dog, and consequently the length of the stitch.

Various minor modifications and changes in the construction of the parts may be made without departing from the spiritof my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, isl 1. A feeding mechanism for sewing machines, comprising a driving-shaft and a feeddog-carrying bar, and an inclined eccentric pivoted upon the driving-shaft and operatively connected with the feed-dog-carrying bar, with means for adjusting said eccentric; substantially as described.

2. A feeding mechanism for sewing machines, comprising a feed dog-carrying bar pivoted at one end to a rocking support,a driving-shaft, an inclined eccentric pivoted on said shaft, and means for adjusting the inclination thereof, and connections between said inclined eccentric, and the feed-dog-carrying bar; substantially as described.

3. A feeding mechanism for sewing-machines,including a feed-dog-carrying bar,and means for operating the same, including an inclined eccentric with means for swinging it to vary the inclination, and means for rotating said eccentric, substantially as described.

4f. A sewing-machine comprising a drivingshaft, a feed-dog-carrying bar parallel therewith, connections between the driving-shaft, and said feed-dog-carryin g bar, for giving the latter rising-and-falling, as well as forwardand-backward movements, said connections including an eccentric, pivotally mounted on the driving-shaft and operated by the latter to give the rise and fall and having a universal-joint connection with the feed-dog-carrying bar, with means for adjusting said eccentric on its pivot.

5. A feeding mechanism for sewingmachines comprising a driving-shaft, an eccentric pivoted thereon, a feed-'dog-carrying bar, a universal-joint connection between said eccentric and the feed-dog-carrying bar, said connection being applied to the latter intermediate its ends, and means for securing the eccentric in any position to which it may be tilted; substantially as described.

6. A feeding mechanism for sewing -ma'- chines and the like comprising a drivingshaft, an eccentric, a pivotal pin for securing the eccentric to the shaft, lugs extending laterally from either side of said eccentric, screws passing through the driving-shaft and adapted to bear against the lugs to Vary the angle of inclination of the eccentric with respect to the axis of the driving-shaft and operative connections between the eccentric and the feed-dog-carrying bar whereby the ICO TIO

latter is reciprocated both vertically and lonchines and the like comprising a drivingshaft, an eccentric thereon set with its vertical axis at an oblique angle to the drivingshaft and having a circumferential groove, a strap embracing the eccentric and bearingin the groove and having an upwardly-extending lug or post provided with a ball, a feeddog-carrying bar or rod having a socket for the reception of the said ball, and means for adjusting the inclination of the eccentric to the axis ofthe driving-shaft; substantially as described.

8. A feeding mechanism for sewingmachines and the like comprising a drivingshaft, an eccentric, a pivotal pin for securing the eccentric to the shaft, lugs extending laterally from either side of said eccentric, screws passing through the driving-shaft and adapted. to bear against the lugs to vary the angle of inclination of the eccentric With respect to the axis of the driving-shaft, said eccentric having a circumferential groove, a strap embracing the eccentric and bearing in the groove, and a ball-and-socket connection between the strap and the feed-dog-carrying bar; substantially as described.

A3. A sewing-machine feeding mechanism comprising a rocking frame, a feed-dog-carrying bar pivoted thereto and having a support at its forward end,`a driving-shaft, an eccentric thereon, arranged with its axis inclined adjustably to the axis of the shaft, a strap embracing the eccentric and aball-andsocket connection between the strap and the feed-dog-carrying bar; substantially as described. v

lO. In the herein-described mechanism the combination with the driving-shaft, inclined eccentric mounted thereon, of the feed-dogcarrying bar having at its forward end branches, a feed-dog secured thereto between the branches, said bar having secured to it a piece formed with lthe body, a socket, and a connecting member between the bar and eccentric having a ball fitting within said socket;

substantially as described.

Witnesses:

CHAs. L. STVURTEVANT, HARRY Y. DAVIS. 

